Anyone put a fuel cell in a 64-66 Cuda? Bad idea? Fumes?

following, considering the same for my 65
LOL, when I saw my email alert that GRUMPY PETE responded to my question I braced myself for a "GRUMPY" response like "hey dumb *&^ just put the fuel cell in and figure it out!" But instead Grumpy and I will be on a mission to figure this out, LOL